A Non-Traditional Variant Nonlinear Energy Sink: Harmonically Forced Responses

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  • This study focuses on simultaneous vibration suppression and energy harvesting in a broad frequency band. For this purpose, a variant nonlinear energy sink (NES) is developed. The developed variant NES consists of a nonlinear oscillator and an electromagnetic energy harvester. Unlike a true NES, the nonlinear oscillator’s spring is not essentially nonlinear. The variant NES is attached to a single-degree-of- freedom (SDOF) primary system that is subjected to a base excitation. Different from the traditional way, the electromagnetic energy harvester is placed between the oscillator’s mass and the base. This study investigates the performance of this non-traditional variant NES under harmonic base excitation. First, the developed apparatus is described. Subsequently, the approximate solutions of steady state responses are derived using the harmonic balance (HB) method. Next, computer simulations are conducted using both the HB method’s solution and numerical integration. The results show that under harmonic excitation, the proposed apparatus behaves similarly to a true NES with the following features: amplitude jump, excitation level dependence, strongly modulated response (SMR), etc. Overall, the non-traditional variant NES can achieve vibration suppression and energy harvesting in a broad frequency band.

    Part of Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.

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    Article (Published)
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    Attribution-NonCommercial 4.0 International